bcoz I hate my ATI 5450
and my motherboard nvidia suits best ..
maybe i will go for GT 520 DDR3 2GB
5450 is the slowest card in ati 5000 series. Ever tried with 5770 or better in your system?
8600gt is more powerful than 5450 which is similar nvidia 8400gs. Nvidia 8400gs is as slow as 5450. So no need to hate Ati.
Buy a decent ati card and you will be fine.